//
//  UIImage+condense.m
//  QCash
//
//  Created by 张葱 on 2019/4/28.
//  Copyright © 2019年 Qworks. All rights reserved.
//

#import "UIImage+condense.h"

@implementation UIImage (condense)
- (NSData *)compressQualityWithMaxLength:(NSInteger)maxLength {
    CGFloat compression = 1;
    NSData *data = UIImageJPEGRepresentation(self, compression);
    if (data.length < maxLength) return data;
    CGFloat max = 1;
    CGFloat min = 0;
    for (int i = 0; i < 6; ++i) {
        compression = (max + min) / 2;
        data = UIImageJPEGRepresentation(self, compression);
        if (data.length < maxLength * 0.9) {
            min = compression;
        } else if (data.length > maxLength) {
            max = compression;
        } else {
            break;
        }
    }
    return data;
}

+ (UIImage *)image:(UIImage *)image rotation:(UIImageOrientation)orientation

{
    
    long double rotate = 0.0;
    
    CGRect rect;
    
    float translateX = 0;
    
    float translateY = 0;
    
    float scaleX = 1.0;
    
    float scaleY = 1.0;
    
    
    
    switch (orientation) {
            
        case UIImageOrientationLeft:
            
            rotate = M_PI_2;
            
            rect = CGRectMake(0, 0, image.size.height, image.size.width);
            
            translateX = 0;
            
            translateY = -rect.size.width;
            
            scaleY = rect.size.width/rect.size.height;
            
            scaleX = rect.size.height/rect.size.width;
            
            break;
            
        case UIImageOrientationRight:
            
            rotate = 3 * M_PI_2;
            
            rect = CGRectMake(0, 0, image.size.height, image.size.width);
            
            translateX = -rect.size.height;
            
            translateY = 0;
            
            scaleY = rect.size.width/rect.size.height;
            
            scaleX = rect.size.height/rect.size.width;
            
            break;
            
        case UIImageOrientationDown:
            
            rotate = M_PI;
            
            rect = CGRectMake(0, 0, image.size.width, image.size.height);
            
            translateX = -rect.size.width;
            
            translateY = -rect.size.height;
            
            break;
            
        default:
            
            rotate = 0.0;
            
            rect = CGRectMake(0, 0, image.size.width, image.size.height);
            
            translateX = 0;
            
            translateY = 0;
            
            break;
            
    }
    
    
    
    UIGraphicsBeginImageContext(rect.size);
    
    CGContextRef context = UIGraphicsGetCurrentContext();
    
    //做CTM变换
    
    CGContextTranslateCTM(context, 0.0, rect.size.height);
    
    CGContextScaleCTM(context, 1.0, -1.0);
    
    CGContextRotateCTM(context, rotate);
    
    CGContextTranslateCTM(context, translateX, translateY);
    
    
    
    CGContextScaleCTM(context, scaleX, scaleY);
    
    //绘制图片
    
    CGContextDrawImage(context, CGRectMake(0, 0, rect.size.width, rect.size.height), image.CGImage);
    
    
    
    UIImage *newPic = UIGraphicsGetImageFromCurrentImageContext();
    
    
    
    return newPic;
    
}
@end
